A wheel of radius R and mass m is mounted
on a frictionless, horizontal axle as shown in
the figure. A light cord wrapped around the
wheel supports an object of mass M; the
weight is released from rest at the level of A.
Which of the quantities
A. Sum of the angular momentum of the
wheel about its center of mass and that
of the falling weight about the wheel’s
center of mass;
B. Torque applied to the rotating wheel;
and
C. Kinetic energy of the wheel plus potential energy of the falling weight;
are constant during the fall?
1. B and C only
2. A and B only
3. C only
4. None is true.
5. A only
6. B only
7. A and C only
8. All are true.